Synovitis is inflammation in the synovium, which is the name of the lining inside most of our joints (and also along the course of some of our tendons). Synovitis occurs in many types of arthritis, and is due to entry into the synovium of inflammatory immune system cells from the blood. In rheumatoid arthritis there is a mixture of synovitis and overgrowth of the synovial cells themselves – called synovial hyperplasia.

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